TABLE OF CONTENTS. 



Page. 



1 



Introduction 7 



Classification of the Scaphopoda ^ 



Family Dentaliidae g 



Genus Dentalium ■ g 



Synopsis of the subgenera of Dentalium ^^ 



Family Siphonodentaliidae - ; ■ , „ 



Synopsis of genera of the family Siphonodentaliidae J^ 



Genus Entalina -j^q 



Genus Siphonodentalium ^^ 



Genus Cadulus -j^^ 



Synopsis of the subgenera of Cadulus ^^ 



List of the East American Scaphopoda ^^ 



Geographical distribution '. ' ' ; ." " -V ' 1- 16 



Table showing horizontal and bathymetnc distribution ^^ 



Systematic consideration of the species 22 



Genus Dentalium 22 



Subgenus Dentalium - 22 



Key to the species of the subgenus Dentalium ^^ 



Subgenus Antalis 34 



Synopsis of the groups of Antalis ^^ 



Key to the group of Dentalium occidentale ■ ■ ^^ 



Key to the group of Dentalium antillarum ^^ 



Key to the group of Dentalium ceratum ^^ 



Key to the group of Dentalium bartletti ^^ 



Subgenus Heteroschisma ^g 



Subgenus Fissidentalium • en 



Key to the species of the subgenus Fissidentalium ^^ 



Subgenus Graptacme - gg 



Key to the species of the subgenus Graptacme ^^ 



Subgenus Laevidentalium -_ „„ 



Key to the species of the subgenus Lae^adentallum ^^ 



Subgenus Episiphon 'J.' ■■", 77 



Key to the subspecies of the subgenus Episiphon ^^ 



Subgenus Bathoxiphus ' ' ' V " • ' 1 81 



Key to the species of the subgenus Bathoxiphus ^^ 



Subgenus Compressidens - ; - g3 



Key to the species of the subgenus Compressidens ^^ 



Subgenus Fustiaria g7 



Family Siphonodentaliidae gy 



Genus Entalina U ' 1 " i'- 87 



Key to the species of the genus Entaima ^^ 



Genus Siphonodentalium gg 



Subgenus Siphonodentalium - ''"'V.''' 89 



key to the species of the subgenus Siphonodentalium - - 89 



Subgenus Pulsellum '"\"u 93 



Key to the species of the subgenus Pulsellum 



